I just purchased a 08 GT500. It has a Airraid cold air intake and exhaust that I know of? The boost gauge max is 15 and it pegs it under full throttle . I have searched to see evidence of of a pulley or any other mods. How do you make sure it is stock pulley and etc. How do you know if it has a tune for the bolt-on's. I know you had to have to have a tune for a atleast a cold air?